USB Buck Converter Case - Power OctoPi from your Printer Power Supply - Ender 3 - 4040

thingiverse

This is a simple case for a buck converter with a USB port - perfect for powering a Raspberry Pi from your printer's power supply. Here's the buck converter I used: https://www.amazon.com/gp/product/B07121W7Q4/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1 To assemble this case, you'll need: * Two 3mm screws, 10-12mm long * Two 3mm nuts * Wire of an appropriate length (I used 18 gauge with a silicon insulator that's about 2.5mm OD) * Two connectors to connect to your printer's power supply Make sure you know what you're doing before messing around with your printer's power supply. ---Both parts together took about 2.5 hours to print on my Ender 3 (using Cura 4.0 with Creawsome mod) at .2mm layer height. Flip the BUCKcaseLID part for minimal supports. In this orientation, the only support needed is inside the holes for the recessed screw holes on the lid and on the recessed nut holes on the bottom of the tray part of the case - which popped right out using Cura's default support settings. Included file BUCKstandin-STL is a model of the buck converter I used in designing this case. You can print it if you want to make sure your buck convertor is dimensionally identical to mine before printing the case. Or you can load it up in your favorite CAD program and take measurements and compare it to your physical part. It's a tight, secure fit, but shouldn't require any force to get the buck converter seating in the tray. If yours requires forcing, something isn't right. --- I may update this at some point to make it a little more of a finished product, but it works fine as it is. EDIT 5/31/2019: Added two files: BUCKcase2TOPLESS-STL and BUCKcaseSTRAINrelief1-STL. The first file modifies the buck converter tray to be used without the lid, with a bridge across the top of the USB port to help hold the buck converter in place. The second file is a strain relief to hold the wires. These two parts together should allow you to just use the base tray part and leave the top open. There's no other system for retaining the buck converter other than that bridge above the USB port and the strain relief, but there shouldn't be much strain on this once it's installed and the USB cable plugged in. The bridge above the USB port printed fine on my Ender 3 with no supports. These parts have not been tested. Use at your own risk.